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Note 9 - Discontinued Operations (Details Textual) |  | 12 Months Ended
--- | --- | ---
May 02, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Previously Shut Down Locations |  | 2 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | $ 53,323,000 | $ 49,707,000
Number of Remediation Projects |  | 3 |
Accrual for Environmental Loss Contingencies |  | $ 925,000 | 900,000
Accrued Environmental Loss Contingencies, Current |  | 677,000 |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) |  | 25,000 |
Not Held for Sale [Member] |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  |  | 10,000
PFMI [Member] |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 450,000 |  |
Disposal Group, Including Discontinued Operation, Consideration, At Closing, Gross | 75,000 |  |
Disposal Group, Including Discontinued Operation, Consideration, At Closing, Net | 46,000 |  |
Disposal Group, Including Discontinued Operation, Consideration, After Closing | $ 375,000 |  |
Disposal Group, Including Discontinued Operation, Consideration, Number of Monthly Installment Payments | 60 |  |
Disposal Group, Including Discontinued Operation, Consideration, Installment Payment | $ 7,250 |  |
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance |  | 337,000 |
PFMI [Member] | Loss Income from Discontinued Operations, Net of Taxes [Member] |  |  |
Asset Impairment Charges |  |  | 150,000
PFMI [Member] | Current Assets Related to Discontinued Operations [Member] |  |  |
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance |  | 69,000 |
PFMI [Member] | Other Assets Related to Discontinued Operations [Member] |  |  |
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance |  | 268,000 |
PFSG [Member] |  |  |
Payment Resulting from Consent Order |  |  | 201,000
PFSG [Member] | Arbitration with Contractor [Member] |  |  |
Loss Contingency, Loss in Period |  |  | 407,000
PFSG [Member] | Interest Expense [Member] | Arbitration with Contractor [Member] |  |  |
Loss Contingency, Loss in Period |  |  | $ 400,000
PFSG and PFM [Member] |  |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) |  | $ 66,000 |

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